Malicious PDF — malware analysis report

Static analysis result for SHA-256 935e6b3d258fd36d…

MALICIOUS

PDF

82.4 KB Created: 2021-05-10 21:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1817380e2ff9d9248016d404d98c8584 SHA-1: cf6861261cf0cd07b274859f71ffba9a1038ed2b SHA-256: 935e6b3d258fd36d511701ab3de0130c3fbf7571c04e67674d51d51eebf9037d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, appears to be a lure related to technical instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=how+to+turn+on+noritz+tankless+water+heater PDF link annotation
    • http://dipenoguzel.sportsontheweb.net/31396560072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_6051181ce143b.pdfIn PDF document text
    • http://vafutixon.22web.org/15108401228.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/guia_ceneval_derecho_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_603f092a34af2.pdfIn PDF document text
    • http://lukisasore.mywebcommunity.org/tevazibodorupexaperititi.pdfIn PDF document text
    • http://suwetobolubujub.getenjoyment.net/13610217207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377115/normal_5ff33510dde00.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/jozuxuwixevutuxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5fc7a9825a65b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5709f552-15e7-4c2b-ae02-ddb05f9bb619/trigonometry_formula_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4208d9-dc47-48a3-94ba-f9afd460cdf6/kupuvoxibejaxuvofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dcba8fc-63e6-4f66-a0dc-8f1c7e772b99/what_does_up_to_30_mbps_mean.pdfIn PDF document text
    • http://funasuruwet.epizy.com/takolixodaliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9c37fe-a3fa-451a-aad4-17bd031eb603/wawisoxitujibofabasevol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cbee12-5557-4c7a-8c62-84a1818c1395/17009264399.pdfIn PDF document text
    • http://fomepufasele.atwebpages.com/estadistica_anderson_11_edicion.pdfIn PDF document text
    • http://lexamokoxerum.atwebpages.com/anaerobic_digestion_process.pdfIn PDF document text
    • http://tirisesu.onlinewebshop.net/jijiku.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 4820 bytes
SHA-256: 0a43fb7ee072fa6150c55a481b21f564151a98283cc619bf888b486523c77cd3
font_01_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 11388 bytes
SHA-256: 35ada9143d5249b9c84c7c56921c8fb079c052e88ceb0cd6f0dfa2bc9184a905
font_02_sfnt_off00012da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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